TB 9-6625-1982-24
14. Time Base
NOTE
Adjustment of the Time Base Oscillator is no longer performed
unless an out of tolerance value is determined while
performing the Time Base Performance Check.
a. Performance Check
(1) Connect TI 1 MHz Test Point U272, Pin 5 (fig. 2) using 10 X probe to frequency
difference meter SIG INPUT.
Figure 2. Adjustment locations type DC503.
(2) Connect time/frequency workstation 1 MHz OUTPUT to frequency difference
meter REF INPUT, using cable.
(3) Verify that the difference indication on the frequency difference meter is within
130 PPM ((OPT 01) is within 1.7 PPM).
(4) If within tolerance disconnect connections made in a (1) and a (2) above and
proceed to next paragraph. If out of tolerance perform b below.